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rainviewer-api-example.html
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rainviewer-api-example.html
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<!DOCTYPE html>
<html>
<head>
<title>RainViewer API Example</title>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/leaflet.css"/>
<script src="https://unpkg.com/[email protected]/dist/leaflet.js"></script>
<style type="text/css">
li {
list-style: none;
display: inline-block;
}
</style>
</head>
<body>
<ul style="text-align:center; position: absolute;top: 0; left: 0; right: 0; height: 50px;">
<li><input type="button" onclick="stop(); showFrame(animationPosition - 1); return;" value="<" /></li>
<li><input type="button" onclick="playStop();" value="Play / Stop" /></li>
<li><input type="button" onclick="stop(); showFrame(animationPosition + 1); return;" value=">" /></li>
</ul>
<div id="timestamp" style="text-align:center; position: absolute;top: 50px; left: 0; right: 0; height: 80px;">FRAME TIME</div>
<div id="mapid" style="position: absolute; top: 80px; left: 0; bottom: 0; right: 0;"></div>
<script>
var map = L.map('mapid').setView([40.633333, -73.716667], 7);
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attributions: 'Map data © <a href="https://openstreetmap.org">OpenStreetMap</a> contributors'
}).addTo(map);
/**
* RainViewer radar animation part
* @type {number[]}
*/
var timestamps = [];
var radarLayers = [];
var animationPosition = 0;
var animationTimer = false;
/**
* Load actual radar animation frames timestamps from RainViewer API
*/
var apiRequest = new XMLHttpRequest();
apiRequest.open("GET", "https://api.rainviewer.com/public/maps.json", true);
apiRequest.onload = function(e) {
// save available timestamps and show the latest frame: "-1" means "timestamp.lenght - 1"
timestamps = JSON.parse(apiRequest.response);
showFrame(-1);
};
apiRequest.send();
/**
* Animation functions
* @param ts
*/
function addLayer(ts) {
if (!radarLayers[ts]) {
radarLayers[ts] = new L.TileLayer('https://tilecache.rainviewer.com/v2/radar/' + ts + '/256/{z}/{x}/{y}/2/1_1.png', {
tileSize: 256,
opacity: 0.001,
zIndex: ts
});
}
if (!map.hasLayer(radarLayers[ts])) {
map.addLayer(radarLayers[ts]);
}
}
/**
* Display particular frame of animation for the @position
* If preloadOnly parameter is set to true, the frame layer only adds for the tiles preloading purpose
* @param position
* @param preloadOnly
*/
function changeRadarPosition(position, preloadOnly) {
while (position >= timestamps.length) {
position -= timestamps.length;
}
while (position < 0) {
position += timestamps.length;
}
var currentTimestamp = timestamps[animationPosition];
var nextTimestamp = timestamps[position];
addLayer(nextTimestamp);
if (preloadOnly) {
return;
}
animationPosition = position;
if (radarLayers[currentTimestamp]) {
radarLayers[currentTimestamp].setOpacity(0);
}
radarLayers[nextTimestamp].setOpacity(100);
document.getElementById("timestamp").innerHTML = (new Date(nextTimestamp * 1000)).toString();
}
/**
* Check avialability and show particular frame position from the timestamps list
*/
function showFrame(nextPosition) {
var preloadingDirection = nextPosition - animationPosition > 0 ? 1 : -1;
changeRadarPosition(nextPosition);
// preload next next frame (typically, +1 frame)
// if don't do that, the animation will be blinking at the first loop
changeRadarPosition(nextPosition + preloadingDirection, true);
}
/**
* Stop the animation
* Check if the animation timeout is set and clear it.
*/
function stop() {
if (animationTimer) {
clearTimeout(animationTimer);
animationTimer = false;
return true;
}
return false;
}
function play() {
showFrame(animationPosition + 1);
// Main animation driver. Run this function every 500 ms
animationTimer = setTimeout(play, 500);
}
function playStop() {
if (!stop()) {
play();
}
}
</script>
</body>
</html>